Rose Mildew - Podosphaera pannosa
A powdery mildew affecting roses, including Rosa canina and hybrids/cultivated varieties of rose grown in gardens. Leaves, stems, flower stalks, calyces and petals masy be affected. It may also affect Forsythia and some species of Prunus.
Several other powdery mildews can affect Prunus species - see host-lists in Woods et al (2024) more more details.
Rose/Forsythia 
Prunus (microscopy) 
Photograph the mildew on the host plant, and add host species to the comments for your record. If recording on Prunus, microscopic examination will be needed to separate from similar species.
primarily on Roses
It is not considered to be a gall-causer, despite occasionally causing some leaf or shoot distortion (ref.: Redfern, M & Shirley, P. 2023. British Plant Galls. FSC)
Graham Calow
Sharnford, Fosse Meadows
02 July 2021
mildew on Dog-rose
CAPochin
Billesdon Woodland Pond
26 October 2022
Graham Calow
Burbage Common and Woods
10 October 2012
fungal mycelium on Rosa stem
Graham Calow
Sharnford, Fosse Meadows
02 July 2021
mildew on Dog-rose
Graham Calow
Burbage Wood
23 May 2023
anamorph state on Dog-rose
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Species profile
- Common names
- Rose Mildew, Rose Powdery Mildew
- Species group:
- fungus
- Kingdom:
- Fungi
- Order:
- Helotiales
- Family:
- Erysiphaceae
- Records on NatureSpot:
- 38
- First record:
- 10/10/2012 (Calow, Graham)
- Last record:
- 12/09/2024 (lemmon, roy)
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